A concept device called the Commuter Cyclists Sustainable Energy Source designed by Deco Goodman could harness motion from bicycling as a form of renewable energy. The generator is comprised of several components, some of which you have to attach to different parts of the bike for the system to work. For example, there are copper coils and magnets to be placed on the spokes of the bike.

The unit that stores energy harnessed is clipped near the bike's taillight. Through the use of copper sheet wires going through the body of the bike, the energy harnessed could be used to power the headlight - that is just, however, one possible application. The generator can harness energy from a variety of actions including braking, biking through road bumps, and going downhill, just to cite a few.